1 files changed, 57 insertions, 0 deletions
diff --git a/Core/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S b/Core/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S
new file mode 100644
index 0000000000..e034bc2e2e
--- /dev/null
+++ b/Core/UefiCpuPkg/CpuDxe/Ia32/CpuAsm.S
@@ -0,0 +1,57 @@
+#------------------------------------------------------------------------------
+#*
+#*   Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+#*   This program and the accompanying materials
+#*   are licensed and made available under the terms and conditions of the BSD License
+#*   which accompanies this distribution.  The full text of the license may be found at
+#*   http://opensource.org/licenses/bsd-license.php
+#*
+#*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#*
+#*    CpuAsm.S
+#*
+#*   Abstract:
+#*
+#------------------------------------------------------------------------------
+
+
+#.MMX
+#.XMM
+
+#------------------------------------------------------------------------------
+# VOID
+# SetCodeSelector (
+#   UINT16 Selector
+#   );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(SetCodeSelector)
+ASM_PFX(SetCodeSelector):
+    movl    4(%esp), %ecx
+    subl    $0x10, %esp 
+    leal    setCodeSelectorLongJump, %eax 
+    movl    %eax, (%esp)
+    movw    %cx, 4(%esp)
+    .byte   0xFF, 0x2C, 0x24   # jmp *(%esp)  note:(FWORD jmp) 
+setCodeSelectorLongJump:
+    addl    $0x10, %esp 
+    ret
+
+#------------------------------------------------------------------------------
+# VOID
+# SetDataSelectors (
+#   UINT16 Selector
+#   );
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(SetDataSelectors)
+ASM_PFX(SetDataSelectors):
+    movl    4(%esp), %ecx
+    movw    %cx, %ss
+    movw    %cx, %ds
+    movw    %cx, %es
+    movw    %cx, %fs
+    movw    %cx, %gs
+    ret
+
+#END
+